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SUMMARY Thick suspensions of spores of Bacillus gtobigii did not germinate com- pletely in nutrient media because the first spores to germinate released a substance which inhibited germination of the remainder. The inhibitory substance was identified as D-alanine by chromatography, high voltage electrophoresis, and its destruction by D-aminO acid oxidase. When 14C-~-alanine was used to induce germination of B. globigii spores, the resulting inhibitory malanine was W-labelled with the same specific activity as the W-L-alanine used. Auto-inhibition of B. globigii spore germination is therefore due to racemization of exogenous L-alanine, which forms sufficient D-alanine to arrest the germination process in thick suspensions of spores.

Identification of d-Alanine as the Auto-Inhibitor of Germination of Bacillus globigii Spores